Title :
A quadrature IF mixer with high image rejection for continuous-time complex ΣΔ modulators
Author :
Pun, Kong-Pang ; Choy, Chiming ; Cheong-Fat Chan ; Franc, José E.
Author_Institution :
City Univ. of Hong Kong, China
Abstract :
With an integrated mixer, the continuous-time (CT) lowpass ΣΔ modulator is highly suitable for A/D conversion of IF signals. In this paper, a quadrature IF mixer with high image rejection is proposed for this application. By employing a channel sharing technique and a special clocking scheme, the proposed mixer is insensitive to resistor mismatches and LO phase errors, which are major error sources for image rejection. Simulation results verifying the concept are presented.
Keywords :
continuous time systems; mixers (circuits); sigma-delta modulation; A/D conversion; IF signals; LO phase errors; channel sharing technique; clocking scheme; continuous-time complex ΣΔ modulators; error sources; image rejection; integrated mixer; quadrature IF mixer; resistor mismatches; Analog-digital conversion; Chromium; Clocks; Computed tomography; Delta modulation; Frequency conversion; Image converters; Phase modulation; Resistors; Wireless communication;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1010429
